Shelter



FIG. 1 is a top, front and right side perspective view of a shelter showing my new design;

FIG. 2 is a bottom, front and left side perspective view thereof;

FIG. 3 is a rear elevational view thereof; and,

FIG. 4 is a perspective view of a second modified embodiment of the design shown in FIGS. 1 thru 3 with a front wall panel. 

The ornamental design for a shelter, as shown and described. 